package com.example.test;

import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor
{
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,Object o)
    throws Exception
    {
        String reqPath =httpServletRequest.getServletPath();
        //只有返回true才会继续向下执行，返回false取消当前请求
        HttpSession session =httpServletRequest.getSession();
        if (session == null || session.getAttribute("user") == null){
           httpServletResponse.setStatus(HttpStatus.UNAUTHORIZED.value());
         // httpServletResponse.sendRedirect("/login");
            return false;
        }
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
         HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView)throws Exception{

    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,HttpServletResponse httpServletResponse,Object o,Exception e)throws Exception{

    }
}
